To give quarter

(Mil.) to accept as prisoner, on submission in battle; to forbear to kill, as a vanquished enemy.

See also: Quarter

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References in classic literature ?
"Milor had better not wear that military coat," said he; "the Frenchmen have sworn not to give quarter to a single British soldier."
With both sets of forwards refusing to give quarter, there were some abrasive challenges and strong tackles flying in early on and, from a turnover from one of these, Jersey ran the ball through several players the length of the pitch, before O'Conner's cross-field kick fell to Grant Pointer who, despite an unkind bounce, gathered the ball and forced his way over for Jersey's only try.
The guerrilla cannot afford to give quarter to traitors, spies, or deserters; and atrocities against enemy troops and their civilian sympathizers are common in waging war on the enemy's morale and political will.